Abstract
Methods of measuring rhizoctonia patch in cereals are compared. Included are mapping and determination of area with a leaf area planimeter, aerial photography and determination of area by a grid overlay, a patch scoring technique, sampling and assessing for rhizoctonia root rot, and determination of yield. Mapping, aerial photography, and patch scoring were all highly correlated. Of these methods, the patch scoring technique was the quickest and most convenient. Yield within a patch was about 8% of yield immediately outside the patch.
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